Last decade has witnessed the unique ability of localized surface plasmon resonance nanostructure to significantly enhance upconversion luminescence efficiency of lanthanide ions, which has been demonstrated in terms of either increased absorption cross section or accelerated radiative decay rate (Purcell effect) induced by the concentrated electromagnetic field. Herein, we report the upconversion luminescence enhancement of NaGdF4:Yb/Er by dual plasmonic Au–CuS heterodimer nanocrystals, where both the local field enhancement effect and Purcell effect, initialized by different parts of the heterodimer, contribute jointly to the enhancement of upconversion emissions. This work provides the possibility to implement LSPR-based enhancement of upconversion luminescence by metal–semiconductor dual plasmonic antennas, where the judicious combination of active LSPR wavelengths can be manipulated via geometrical design of hetero-nanostructure.

中文翻译：

---

利用 Au-CuS 异二聚体增强 NaGdF4:Yb/Er 纳米晶体的上转换发射

过去十年见证了局部表面等离子体共振纳米结构显着提高镧系元素离子的上转换发光效率的独特能力，这已通过增加的吸收截面或由集中电磁场引起的加速辐射衰减率（珀塞尔效应）得到证明. 在此，我们报告了双等离子体 Au-CuS 异二聚体纳米晶体对 NaGdF4:Yb/Er 的上转换发光增强，其中由异二聚体的不同部分初始化的局部场增强效应和珀塞尔效应共同有助于增强上转换发射. 这项工作提供了通过金属-半导体双等离子体天线实现基于 LSPR 的上转换发光增强的可能性，